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Question

Which among the following is not correctly matched with their colour? 
      $$\text {Compound}$$                            $$\text {Colour}$$


A
Na4[Fe(CN)5NOS]                  purple
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B
Fe4[Fe(CN)6]3                           blue
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C
Fe(CNS)3                                    blood red
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D
AgCl                                               light yellow
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Solution

The correct option is C $$ AgCl $$                                               light yellow
$$A)\underset{from\ sodium\ extracted}{Na_{2}S}+Na_{2}[Fe(CN)_{5}NO]\rightarrow \underset{purple\ colouration}{Na_{4}[Fe(CN)_{5}NOS]}$$


$$B) Na_{4}[Fe(CN)_{6}]+Fe^{+3}\rightarrow \underset{Ferric\ ferrocynid\\ \\ (blue\ colour)}{Fe_{4}[Fe(CN)_{6}]_{3}}$$


$$C)Fe^{+3}+3NaSCN \rightarrow \underset{\ \ Ferric\ thiocynate\\  \\   (Blood\ red\ colouration)}{Fe(SCN)_{3}}$$


$$D)Na+Cl\xrightarrow[From\ o.c]{\Delta }NaCl\xrightarrow[]{AgNO_{3}}\underset{white\ ppt}{AgCl}+NaNO_{3}$$


$$\therefore AgCl$$ is incorrect match with its colour

$$\mathbf{Hence\ correct\ answer\ is\ option\ (D)}$$




Chemistry

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